Impossible to know that now. A Grand Jury is a tool for prosecutors to gather facts. You realize half of our States dont even use Grand Juries? They use Preliminary Hearings. That's all a GJ is. No defense lawyers can even be there.
As a practical matter, a federal grand jury will almost always return an indictment presented to it by a prosecutor. This is the basis for Judge Sol Wachtler's famous saying that a prosecutor can get a grand jury to “indict a ham sandwich.” http://corporate.findlaw.com/litigation-disputes/federal-grand-jury-crash-course.html
And now CNN is reporting that Mueller has crossed Trump's "red line": Mueller is investigating financial ties between Trump, Trump's family, and Russia.
An old saw is that a prosecutor can have a ham sandwich indicted if he wants. It the prosecutors took. He can use it to indict or clear the object's name.
We have grand jury about twice a month. It's how people get a return of a true bill or no billed. Most people waive prelims, but then again it isn't on a federal level. Maybe I'm confused about why a prosecutor would use a grand jury as a fishing expedition. i was mainly referring to the order and process of events. But I'll sit back down. I might just be tired.
If I understand it right,.. the Federal Prosecutor, (Robert Mueller), collects the evidence and presents it to the Federal Grand Jury. They then decide whether indictment is warranted or not.